Brake



A. c. STARR BRAKE vl mR E N NR R .MA m NT T l A s C T R E B L A Y B 4 5 w1 f Patented Oct. 17, 1933 uNiTED si'xrlssV Laatst PATENT oFFier-Jv BRAKE Albert Cooper Starr,- Nephi, Utah,A assigner to Bendix Brake Company, South Bend, Ind., a

corporation of Illinois Application July 19, 1927.8. Serial KNO, 293,872Y

24 Claims. (Cl. 18S-78) rangement of a novel brake-applying leverhav-L ing thrust portions on its opposite sides, and which preferably is pivoted to another operating lever in a manner permitting it to float to balance its thrusts in opposite directions, and which in the preferred embodiment is arranged in an inclined position in operative engagement with thrust projections on the ends of the brake shoes or their equivalents.

Another important feature relates `to a novel linkage or lever mechanism for forcing the secondary shoe or equivalent friction means against the drum when the brake is applied, and which "Z preferably includes a stop which determines the released position of the shoe. l Y The above and other objects and features of the invention, including various novel details of construction, will be apparent from the follow-` ing description of the illustrative embodiment shown in the accompanying drawing, in which: Figure 1 is a vertical section through the brake just inside the head" of the brake drum, and showing the brake shoes in side elevation.

Figs. 2, 3, and 4 are respectively sections on lines2-2, 3-3,.and 4-4 on Fig. 1.

` The brake selected for illustration includes a rotatable drum 10, at the open side of which is a support such as a backing plate 12. Within the drum is arranged the friction means, preferably including a primary shoe 14, a secondary shoe 16, and an auxiliary shoe 18. Shoe 14 is connected to shoe 16 by a iloating'pivot 20, andshoe 18 is Y anchored on a fixed pivot 22 carried bythe back-r ing plate. Shoe 16 preferably projects past the pivot 22 nearly to the heel of the friction surface of shoe 18, thus inv effect overlapping a portion 'of the shoe 18.

The brake is preferably applied by a novel float- Projecfrom portions 26 and 28 are, for the short arcs of movement, substantially perpendicular tothe ends of projections 30 and 82,` and there is Vsubstantially no rubbing or friction of portions 26 and 28 against the projections 30 and 32. Lever 24 is preferably connected, by a pivot 36 or the like, to an operating lever 38 having a fixed fulcrum, andvwhich is shown keyed on the brakeapplying shaft 40.

Shoe 16 is shown formed with aY slot 42 embracing a pin or roller 44 projecting laterally from aj member46 mounted on a pivot 48 carried Yby the backing plate, androcked about pivot 48 as' an operating lever by movement of shoe 16 Ato the right when the brake is applied. A device 50,is pivoted, preferablyv on member 46, by a pin 52, and has a pin or roller 54 engaging the edge of the stiffening web of shoe 16. Movement of member. 46 to the right causes the end Vof device 50 `to be held by a fixed adjustable stop 56, .to rock'- pin 54 downwardly to force the shoe 16 toward the drum.

-When the brake is released, auxiliary return springs 58 and 60, connected to opposite ends of shoe 16, urge the shoe inwardlyagainst a cam surface on the bottom of the stop 56.

While one illustrative embodiment has been described in detail, it is not my intention to limit its scope to that particular embodiment, or otherwise than by the terms of the appended claims.

.I claim: I

1. A brake comprising, in combination, a drum, friction members within the drum having adjacent separable ends formed with projections one of which is further from the center' of the drum than the other and which terminate approximately at the same radius of the drum, and an operating lever inclined with respect to said radius and extending between said separable ends and having thrust portions engaging said projections, together with operating means engaging the end of. said lever inside ofsaid ends.

2. A brake comprising, in combination, a drum, friction members within the drum having adjacent separable-ends formed with projections one of which is further from the center of the drum. than the other and which terminate approximately at the same radius of the drum, and a floating operating lever extending between said separable ends and'having thrust portions engaging said projections, together with-operating means engaging the end of said lever inside of said ends.

3. A brake comprising, in combination, a drum, friction members within the drum having adjacent separable ends formed with projections` oneprojection on the other side of the lever betweenV applying means.

its ends.

5. A brake-applying lever formed Witha-thrust I projection at one side of thelever at-one end and with a thrust projection on the other side of the lever between its ends.

6. A brake comprising, in combination, a drum, a pair of connected shoes arranged end to end and engageable with the drum, applying means acting-on one shoe directly and indirectlyon the other shoe-through said onershoe,andconnected power-multiplying levers acting on said other shoe, and forcing it radially against the drum automatically when -the brake is applied.

"7. A brakecomprising, in combination, a drum, a pair of lconnected shoes arranged end to end and lengageable with the drum, applying means acting on one shoe directly and Vindirectly on the other shoe through said one shoe, a link connected Vto said other shoe, and means operated by the swinging of the link to force said other vshoe against the drum automatically when the brake is applied.

8. Abrake comprising, in combination, a drum, friction means adjacent the drum, a member pivoted at one end and operatively engaged by the friction means at its other end, and a device pivoted on said member and operated by movement ofvsaid member to force the friction means toward the drum.

9. A brake comprising, in combination, afdrum, friction meansadjacent the drum, a member Apivotedat one end and operatively engaged by the friction means at its other end, and a pivotallymounted device operated by movement of said member to force the friction means toward the drum.

10. A brake comprising, in combination, a drum, frictionmeans engageable with the drum, a member engaged by the friction means and moved by the application of the brake, a device engaging the friction means and pivotally engaged by said member, and a stop engaged 'by said device and operating when said member moves to rock said device to force the friction means toward the drum. Y

1l. A brake comprising, in combination, adrum, friction means engageable with the drum, a member engaged by the friction means and moved by the application of the brake, a device engaging the friction means and pivotally engaged by said member, a stop engaged by said device and operating when said member moves to rock said device to force the friction means toward the drum, said stop also being engaged by the friction means to determine its position when the brake is released.

12. A brake comprising, in combinatioma drum, a pair of connected shoes arranged end to end and engageable with the drum, applying means acting on one shoe directly and indirectly on the other shoe through said one shoe, and connected Shoe, and forcing it against thedrum automatically when the brake is applied, together with a third shoe which is anchored and which is operatively engaged by said applying means.

13. A brake comprising, in combination, a drum, a pair of connected shoes arranged end to end and engageable with the drum, applying means acting on=one shoe directly and indirectly on the other shoe through said one shoe, and connected power-multiplying levers acting on said other shoe, and forcing it against the drum automatically When the brake is applied, together with a third shoe which is operatively engaged by said 14. A brakecomprising a drum, in combination -with friction means Within the drum, a fixed pivot `adapted to serve as an anchor taking the torque of the friction means, and a leverage device mounted lon said pivot and having a pivotal and radially-slidable connection with the friction means and having a part pivoted thereto and operated'by the friction means svvingingsaidldevice on the pivot in such a manner .as to force the friction meansslidably of said connection radially against the drum.

15. Abrake comprising a drum, in combination withV `friction means within kthe drum, means adaptedto serve as an anchor taking the torque of the friction means, and a device pivotedon said means and having apivotaland radially-slidable connection with the friction means and having a part movably connected therewith and operated by movement of the friction means in such a manner as to force the friction means slidably yof said-connection radially against vthe drum.

16. A brake comprising a drum, lincombination with friction means within the .-drum, means adapted to serve as an anchor taking the :torque of fthe friction means, and a device :pivoted yon said vmeans and having apivotal and radially-slidable connection with the friction meansand -having connected relatively-movable "parts yone of which is operated by movement vof the l.friction means in such a manner as to force the friction means slidablyof said connection radially against the drum, the torque of vthe friction meansbeing transmitted to the anchor means through said device.

17. A brake comprising a drum, in combination with friction means, and a ,pivotally-mounted device connected to the friction means and taking its torque and having connected relativelymovable-parts oneof `which is'operated by `pivotal movement of the device to force thefriction'means against `the drum.

18. A brake comprising a drum, in combination with 4friction means, and a pivotally-movable anchor device taking the torque of the friction means and including pivotally connected parts arranged to be 'moved by the friction means to force 'the friction means adjacent the anchor device against the drum.

, 19. A brake comprising a drum, incombinaton with friction means, and apivotally-movable anchor device taking the torque of the friction means and arranged to be moved by the friction means to force the friction means adjacent the anchor device against the drum, said pivotally-movable device having a projection and the friction means having a part slidably embracing the projection in amanner permitting the described shifting of the friction means toward the drum, together with a lever pivotally engaging said device and the friction means-and arranged to move the friction means as described.

2'0. .A brake comprising a drum, lin combination with friction means, and a pivotally-movable anchor device taking the torque of the friction means and having a. part arranged to be moved by the friction means to force the friction means adjacent the anchor device against the drum, said part being pivotally carried by said device.

21. A brake friction means anchorage device comprising a lever mounted on a fixed anchor pivot and having pivotal and radially-slidable engagement with the friction means, and a second lever pivoted to an intermediate part of the first lever.

22. A brake friction means anchorage device comprising a lever mounted on a fixed anchor pivot and having pivotal and radially-slidable engagement with the friction means and having a relatively-movable part shifted with respect to said lever by movement of the brake friction means in such a manner as to force the friction means toward the drum.

23. A brake comprising a drum and friction means within the drum and an applying device for the friction means at one side of the drum and provided, across the drum from the applying device, with anchorage meansincluding an an chor pivot and a lever device mounted on said pivot and provided with a 'pivotally-mounted part actuated by movement of the friction means when tion means thereto and provided with a pivotallymounted part actuated by movement of the friction means when the brake is applied to shift the adjacent portion of the friction means toward the drum.

ALBERT COOPER STARR. 

